For the true burr puzzle fan here is a terrific set of puzzles that will provide many hours of challenge. The 27 pieces will make over 60 different 6-piece Burrs, or notched sticks, using the solid keypin piece, and an unknown number of burrs using no keypin. Beautiful box with wood dividers provides an attractive and safe home for your set. Each piece is 3 1/8" long. This set is documented in “Creative Puzzles of the World” by Van Delft and Botermans 1978.